Omega 3861 — intermittent loud “tink” noise every 30 seconds

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I have a 2021 Speedy with 3861. It's never been abused and has never been serviced. I noticed recently there is an intermittent single loud tick about ever 30 seconds or so (but can be more frequent.). When the single loud tick occurs, it sounds like a tap on piece of plastic. Any idea what this issue could be?

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